Just use one of those cubby holder deals people are crafting and stick an ipad to it. I don't think the crappy little screen they threw in the Mav would be any good for watching videos anyway.
Why would you want this for the Maverick? I'm just going to assume/hope you wouldn't be watching Netflix while driving. The Mavericks screen is only 8 inches and I imagine not the highest resolution or quality. You can pick up a tablet for a whole lot cheaper than $400 - that's your alternative
You can probably find used tablets of different varieties for a dime a dozen these days. That’ll be oodles better than a hacked up device to force video onto the infotainment screen, you can connect a tablet to usb/outlet power, and bluetooth for sound output to the truck stereo, use hotspot or phone tether, etc. Seems like that would be very simple.